This is not how it works, though. As soon as the patient starts getting inside the machine - carnage.
The magnet is always active.
Edit: I’ve been schooled.
No, coins aren’t ferromagnetic.
Sure. But then why did the dude in the comic die, then? Exploding coins?
But then why did the dude in the comic die, then? Exploding coins?
You have a better explanation?
I thought I did.
Absolutely not always. Yes, there are MRI with permanent magnets, but these are huge and only reach up to 0.4 Tesla. Electromagnets are the standard today:
“Helium cooled superconducting magnets are the most common type found in MRI scanners today.” - https://en.m.wikipedia.org/wiki/Physics_of_magnetic_resonance_imaging
Thank you. I’ve been schooled and I stand corrected.
No, you were right. MRI machines that can be turned on and off are of two varieties, the regular electromagnet, and the superconducting one. The regular electromagnet versions are obsolete, they take up to an hour of being turned on before you can get accurate measurements from them. Almost all MRI machines in operation today are of the superconducting type.
Superconducting magnets take hours to turn on. They need to get a lot of electricity running through them. It needs to be kept at a superconducting temperature, and charging it heats it up. They also take quite a while to turn off, though faster than turning on. Their fast emergency shutdown involves releasing their liquid helium coolant. If you want a video of this, search “MRI quench”.
These MRIs are only turned off for maintenance. MRI machine rooms are highly restricted, anyone entering must be screened for potentially dangerous objects. For more info, search for “are MRI machines always on”.
i need you over at !comicstrips@lemmy.world
Posted. I hope they like it, lmao
I had an MRI two years ago. Let’s just say that I felt a few skin pricks when it started up. As a handyman I had a few microscopic bits of metal in my skin. No bleeding though so it wasn’t bad.
Damn, I need this. I get metal slivers and dig them out with a vet needle, but I’ve got a couple that I can’t get to right now that annoy me every time I put pressure on them. I go digging around until I’m bleeding again but can’t seem to find them.
I’m glad it worked out for the other guy, but metal doesn’t necessarily take the easiest route out- a sliver on the back of your hand might exit out of your palm
Easiest for whom? For the metal sliver, that path would be the easiest one.
But it doesn’t take the easiest path. That’s the point. It takes the path that aligns with the magnetic field. Which might take it through your palm.
Hm, no, it actually does take the easiest path. See, if there was a real obstacle in the magnetic field lines, the object would take some other path of lesser resistance. That’s not this case so… yeah. Shortest path. Doable path. Easiest.
deleted by creator
But that’s my point. For a magnet, that path is the easiest one. Any other path goes against its nature. Like gravity.
Removed by mod
There isn’t an off the shelf magnet that’s going to take care of this. If there was you would never be able to take it off the metal shelf.
Ulnar plate. I feel this comment.
I almost lost my glasses to the MRI. I was assisting anesthesia for an ICU MRI and as I leaned in to adjust something for the patient my glasses started lifting up. That is when I remembered i have 4 small neodymium magnets in the frame for addon sunglasses.
I quickly pulled away, but had I leaned in I would have probably lost them.
No, you wouldn’t have lost them as you’d know exactly where they’d be.
Forever.
My glasses! I can’t see without my glasses!
blindly smashes the quench button
Oh wow. This reads like an onion headline.
The article reads like a high school newspaper. Or maybe Forbes just requires a joke every other paragraph, with no requirement for joke quality?
How the hell?
São Paulo, Brazil
Oh, makes sense now
My go-to video:
This is how you science.
There was a story not too long ago about the need to make sure all of one’s… intimate items are pure silicone before going into an MRI.
What, tampons?
Piercings, especially genital piercings that people sometimes forget, and butt plugs.
Ty
What about copper IUDs?
What would an MRI machine do to my pacemaker?
Most new pacemakers and leads are MRI safe. They will place it in a safe mode before running the MRI.
Probably try to rip it out of your chest. I had an MRI a few months ago, and one of the questions they asked me was if I had a pace maker. Pretty sure they’d have to find another way to do the imaging.
Not the case at all, all modern medicinal implants are non-magnetic. For pacemakers the problem is the magnet can alter the pacemakers function or turn it off. Basically every single modern pacemaker is MRI compatible regardless, but they might have to put it in a special MRI mode before and return it to normal afterwards.
What would happen if you ate 10-20 iron supplement tablets right before going into one of those?
Very cool, so the blur was from interference caused by the un digested supplements? I guess the real question I’m asking is what if I threw a handful of iron tablets in there like in this video? Will there be enough attraction to see similar results? And yes I’m trying to confirm that it wouldn’t rip your guts open from the inside out, as cool as that would be in a movie, obviously not real life though.
15 or so iron supplements might contain a whole gram of iron overall, about a peperclip’s worth. Given the size of each supplement, their density may greatly diminish the magnetic force exerted on each one, but we’d need some numbers to do any real calculations.
It would look like the magneto prison escape scene
Getting an MRI is how I found out I’m claustrophobic. Fun.
Chu mean homie MRI machines are the perfect place to hide your stash of conveniently discoverable weapons in the long term
On a side note beryllium copper wrenches are good for this kind of work, they’re also sparkless, but they cost like a thousand bucks. They sell cheapo ones on Amazon for like 50 but there’s no way in hell I’d go wrenching around explosive fumes with one
Yup… It’s super dangerous.
I wonder what happens if you have high iron content in your blood
Basically the amount of iron in your body even with a disorder that increases red cell production is neglible both because it is evenly distributed and because being bound into hemoglobin weakens its magnetic properties.
Cool thanks for the answer
Nothing. But I won’t lie and say I wasn’t curious if the magents would cause the iron deposits in my organs from shredding me on a cellular level. Doc said not to worry so I didn’t.
Source: I have hemachromatosis. Had an MRI done with a ferritin count of 2400. For comparison: normal adult males usually have a ferritin count of 24-336.
Are you… The Real Iron Man?
Holy shit…that’s a high level
I’ve always been a little concerned about the bb I caught as a kid. It’s magnetic and buried deep in my hand.
To be fair, this would be a pretty unique way to add to a coin collection for the MRI tech though.
I had an MRI a few months ago. Somehow myself, and the techs missed my wedding band. The machine fired up and I felt my finger pulsing and this weird sensation, immediately squeezed the bulb they give you. Nurse comes in, “DONT TAKE IT OFF!”
She wrapped her hands around my finger and slid it into her hands and carried it out. Crazy how much that machine pulled at that band.
This is bullshit. First off, the magnet doesn’t start pulling when it’s “fired up.” It’s always on and it would have started pulling on your ring as soon as you got close to it. Second, it’s very unlikely that a tech would have missed something as obvious as a wedding band. They do multiple screenings and checks. Maybe, I mean human error is a thing, but given that this story is 100% bullshit from the first point I don’t like seeing hardworking techs getting their names dragged through the mud for your fake internet story. And third, they (again, very unlikely but not impossible that things could have potentially happened the way you told it) would not have removed the ring from your finger and created a loose, dangerous projectile. They would have removed you from the scanner to the screening area and then removed the ring. But again, this never happened. I mean, it’s cool if you want to make up stories on the internet, but don’t disparage people to do it.
Most wedding bands are gold aren’t they? Gold isn’t magnetic and can be worn for MRIs. As can titanium piercings. I have one in the cartilage of my ear that’s stuck. I’ve had multiple MRIs on my knees with it in. I still call bs on that persons story though.
Glad you were there. I’m not disparaging anyone. You are pretty worked up. I recommend taking a deep breath and relaxing.
lol I didn’t need to be there to know this is not true. And you are disparaging the professionals that worked hard to take care of you by saying they’d have made such a stupid and obvious mistake, if you even had an MRI. I am worked up because these are my colleagues and you’re making them out to be morons that don’t know how to do their jobs. Have some decency.
His name is Jerry and my wife works with them. Nothing ever happens, you’re right. Carry on. I LOVE how angry you are that you doubt I even had an MRI. Anything else I can do to make your panties get so twisted? Thanks for disparaging my health issues! Cheers!!!
“Anyone who disagrees with me is angry!” Okay, guy.
What material is your wedding band made out of?
What is the band made out of?
Tungsten carbide.
Ah. That’ll do it.
I was about to say that if you had a gold wedding band, it probably wasn’t the quality of gold you thought it was. Also, it’s probably why the techs might have missed it at first as bands are typically gold.
Tungsten carbide is only very weakly paramagnetic… you need to mix in other metals to get a strong response…
Or, just use a really powerful electromagnet to get a response from something that is paramagnetic, like an MRI.
To your point and to clarify what you mean for anyone else, pure tungsten is paramagnetic, but its the iron (or other) binders that are used in tungsten carbide that are more responsive.
